sw/stm32 - Cryptech HSM on STM-32 ARM processor

diff options
Diffstat (limited to 'bin/debug')
0 files changed, 0 insertions, 0 deletions
href='#n87'>87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296
#!/usr/bin/env python
#
# Copyright (c) 2016, NORDUnet A/S All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# - Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
#
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
#
# - Neither the name of the NORDUnet nor the names of its contributors may
#   be used to endorse or promote products derived from this software
#   without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""
Utility to upload a new firmware image or FPGA bitstream.
"""

import os
import sys
import time
import struct
import serial
import getpass
import os.path
import tarfile
import argparse
import platform

from binascii import crc32

FIRMWARE_CHUNK_SIZE = 4096
FPGA_CHUNK_SIZE = 4096


def parse_args():
    """
    Parse the command line arguments
    """

    share_directory = "/usr/share" if platform.system() == "Linux" else "/usr/local/share"

    default_tarball = os.path.join(share_directory, "cryptech-alpha-firmware.tar.gz")

    if not os.path.exists(default_tarball):
        default_tarball = None

    parser = argparse.ArgumentParser(description = __doc__,
                                     formatter_class = argparse.ArgumentDefaultsHelpFormatter,
                                     )

    parser.add_argument("-d", "--device",
                        default = os.getenv("CRYPTECH_CTY_CLIENT_SERIAL_DEVICE", "/dev/ttyUSB0"),
                        help = "Name of management port USB serial device",
                        )

    parser.add_argument("--firmware-tarball",
                        type = argparse.FileType("rb"),
                        default = default_tarball,
                        help = "Location of firmware tarball",
                        )

    parser.add_argument("--username",
                        choices = ("so", "wheel", "ct"),
                        default = "so",
                        help = "Username to use when logging into the HSM",
                        )

    actions = parser.add_mutually_exclusive_group(required = True)
    actions.add_argument("--fpga",
                         action = "store_true",
                         help = "Upload FPGA bitstream",
                         )
    actions.add_argument("--firmware", "--hsm",
                         action = "store_true",
                         help = "Upload HSM firmware image",
                         )
    actions.add_argument("--bootloader",
                         action = "store_true",
                         help = "Upload bootloader image (dangerous!)",
                         )

    parser.add_argument("--simon-says-whack-my-bootloader",
                        action = "store_true",
                        help = "Confirm that you really want to risk bricking the HSM",
                        )

    parser.add_argument("-i", "--explicit-image",
                        type = argparse.FileType("rb"),
                        help = "Explicit source image file for upload, overrides firmware tarball")

    return parser.parse_args()


def _write(dst, data):
    dst.write(data)
    if len(data) == 4:
        print("Wrote 0x{!s}".format(data.encode("hex")))
    else:
        print("Wrote {!r}".format(data))


def _read(dst):
    res = ""
    x = dst.read(1)
    while not x:
        x = dst.read(1)
    while x:
        res += x
        x = dst.read(1)
    print ("Read {!r}".format(res))
    return res

wheel_pin = 'YouReallyNeedToChangeThisPINRightNowWeAreNotKidding'

def _execute(dst, cmd):
    global wheel_pin
    pin = None
    if args.username == 'wheel':
        pin = wheel_pin
    if args.username == 'ct':
        pin = 'ct'
    _write(dst, "\r")
    prompt = _read(dst)
    if prompt.endswith("Username: "):
        _write(dst, args.username + "\r")
        prompt = _read(dst)
        if prompt.endswith("Password: "):
            if not pin:
                pin = getpass.getpass("{} PIN: ".format(args.username))
            _write(dst, pin + "\r")
            prompt = _read(dst)
    if not prompt.endswith(("> ", "# ")):
        print("Device does not seem to be ready for a file transfer (got {!r})".format(prompt))
        return prompt
    _write(dst, cmd + "\r")
    response = _read(dst)
    return response

def send_file(src, size, args, dst):
    if args.fpga:
        chunk_size = FPGA_CHUNK_SIZE
        response = _execute(dst, "fpga bitstream upload")
    elif args.firmware:
        chunk_size = FIRMWARE_CHUNK_SIZE
        response = _execute(dst, "firmware upload")
        if "Rebooting" in response:
            response = _execute(dst, "firmware upload")
    elif args.bootloader:
        chunk_size = FIRMWARE_CHUNK_SIZE
        response = _execute(dst, "bootloader upload")
    if "Access denied" in response:
        print "Access denied"
        return False
    if not "OK" in response:
        print("Device did not accept the upload command (got {!r})".format(response))
        return False

    crc = 0
    counter = 0
    # 1. Write size of file (4 bytes)
    _write(dst, struct.pack("<I", size))
    response = _read(dst)
    if not response.startswith("Send "):
        print response
        return False

    # 2. Write file contents while calculating CRC-32
    while True:
        data = src.read(chunk_size)
        if not data:
            break
        dst.write(data)
        print("Wrote {!s} bytes (chunk {!s}/{!s})".format(len(data), counter, int(size / chunk_size)))
        # read ACK (a counter of number of 4k chunks received)
        while True:
            ack_bytes = dst.read(4)
            if len(ack_bytes) == 4:
                break
            print("ERROR: Did not receive an ACK, got {!r}".format(ack_bytes))
            dst.write("\r")  # eventually get back to the CLI prompt
        ack = struct.unpack("<I", ack_bytes)[0]
        if ack != counter + 1:
            print("ERROR: Did not receive the expected counter as ACK (got {!r}/{!r}, not {!r})".format(ack, ack_bytes, counter))
            flush = dst.read(100)
            print("FLUSH data: {!r}".format(flush))
            return False
        counter += 1

        crc = crc32(data, crc) & 0xffffffff

    _read(dst)

    # 3. Write CRC-32 (4 bytes)
    _write(dst, struct.pack("<I", crc))
    response = _read(dst)
    print response

    src.close()

    if args.fpga:
        # tell the fpga to read its new configuration
        _execute(dst, "fpga reset")

    if args.fpga or args.bootloader:
        # log out of the CLI
        # firmware upgrade reboots, doesn't need an exit
        _execute(dst, "exit")

    return True


dire_bootloader_warning = '''
                            WARNING

Updating the bootloader risks bricking your HSM!  If something goes
badly wrong here, or you upload a bad bootloader image, you will not
be able to recover without an ST-LINK programmer.

In most cases a normal "--firmware" upgrade should be all that is
necessary to bring your HSM up to date, there is seldom any real need
to update the bootloader.

Do not proceed with this unless you REALLY know what you are doing.

If you got here by accident, ^C now, without answering the PIN prompt.
'''


def main():
    global args
    args = parse_args()

    if args.bootloader and not args.simon_says_whack_my_bootloader:
        sys.exit("You didn't say \"Simon says\"")

    if args.bootloader:
        print dire_bootloader_warning

    if args.explicit_image is None and args.firmware_tarball is None:
        sys.exit("No source file specified for upload and firmware tarball not found")

    if args.explicit_image:
        src = args.explicit_image       # file-like object, thanks to argparse
        size = os.fstat(src.fileno()).st_size
        if size == 0:                   # Flashing from stdin won't work, sorry
            sys.exit("Can't flash from a pipe or zero-length file")
        print "Uploading from explicitly-specified file {}".format(args.explicit_image.name)

    else:
        tar = tarfile.open(fileobj = args.firmware_tarball)
        print "Firmware tarball {} content:".format(args.firmware_tarball.name)
        tar.list(True)
        if args.fpga:
            name = "alpha_fmc.bit"
        elif args.firmware:
            name = "hsm.bin"
        elif args.bootloader:
            name = "bootloader.bin"
        else:
            # Somebody updated other part of this script without updating this part :(
            sys.exit("Don't know which component to select from firmware tarball, sorry")
        try:
            size = tar.getmember(name).size
        except KeyError:
            sys.exit("Expected component {} missing from firmware tarball {}".format(name, args.firmware_tarball.name))
        src = tar.extractfile(name)
        print "Uploading {} from {}".format(name, args.firmware_tarball.name)

    print "Initializing serial port and synchronizing with HSM, this may take a few seconds"
    dst  = serial.Serial(args.device, 921600, timeout = 2)
    send_file(src, size, args, dst)
    dst.close()


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        pass

context:
space:
mode: